向尊敬的曹老师请教！

原问题：https://www.cpsenglish.com/question/34909

例句：What was news to me, his wife was Tom's niece.

在这里。what引导的限定分句作评注性状语；如果让 What was news to me, his wife was Tom's niece.这个句子作discovered 的宾语从句。则为：

Then I discovered ,what was news to me, that his wife was Tom's niece.

在解答中，曹老师您说：“评注性状语在结构上不属于主句，是外围性结构（peripheral）。what从句作为评述分句，必须置于它所附着的分句之前。结构上它又不属于该分句，即that不能置于what分句之前，只能置于what分句所附着分句之前。”

我在这里有两个不明白的点特意向尊敬的曹老师请教：

“what从句作为评述分句，必须置于它所附着的分句之前”

问题1：you are wrong , I think .  这句话中， I think 也是一个限定分句作评注性状语，为啥这里放在了分句you are wrong的后面了呢？

问题2：“结构上不属于该分句” 这句话是啥意思？